Happl - Senior Backend Engineer
Requirements
• 4+ years experience as a Backend or Software Engineer • Strong experience with modern backend languages and frameworks (e.g. Typescript, Golang) • Experience designing and consuming APIs (REST, event-driven systems) • Solid understanding of databases (SQL / PostgreSQL) and data modelling • Experience building and scaling production systems • Familiarity with cloud infrastructure and CI/CD workflows • Comfortable working with integrations and third-party services • Experience using AI tools (e.g. ChatGPT, Claude) as part of your workflow • Clear communicator who works well with both technical and non-technical stakeholders • Proactive, detail-oriented, and comfortable taking ownership • If you don’t meet every requirement but feel this role fits your trajectory, we’d still love to hear from you.
Responsibilities
• This role sits within our Engineering team and works closely with Product, Frontend, Data, and Customer teams across the full development lifecycle. You’ll help shape how we build and scale our backend by focusing on: • Designing and scaling the backend architecture powering a global, AI-first platform • Building and owning core services across benefits, allowances, payments, and reporting • Developing scalable data models and ensure integrity across systems • Improving platform reliability, performance, security, and observability • Automating workflows and Go Rules to streamline complex operations • Collaborating closely with product and frontend teams to ship end-to-end features • Writing clean, well-tested, production-ready code • Using AI tools to accelerate development and iteration • Contribute to architecture, technical decisions, and engineering standards • You’ll play a key role in ensuring Happl’s backend scales as our customer base, features, and global footprint grow.
Benefits
• Help shape the future of employee benefits • Meaningful equity in an early stage growing business • Flexible hybrid working from day one • Access to your own Happl benefits platform • Optional enrolment in Private Health Insurance • Optional enrolment in Dental insurance, including family cover • A flexible Wellbeing budget to spend on whatever wellbeing means to you • Learning & Development (L&D) allowance • Pension scheme from day one • Rapid career progression in a scaling commercial team • Call 1: 20-min Intro call with Ben (COO & CoS) • Call 2: 30-min deep dive with Lee (Head of Engineering) • Call 3: 30-min deep dive with Ben T (CEO & Founder) • Additional Details • Additional Details • Location: London, WaterlooTeam: EngineeringWorking arrangement: Hybrid (3+ Days in Office)
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